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Scientific American, Vol. 44, No. 16 (April 1881) (1881)
leaf 8
e center of the disk. The central opening through ments as a matter of recreation, and which is as efficient as should be as near the face of the revolving glass as possible which the sleeve, C, extends is approximately circular, but could be desired, yielding a spark fully six inches in length,… … for receiving the standard of the lar down upon it. The vulcan- Pig. l.-SIMPLIFIED HOLTZ ELECTRICAL MACHINE. ©1881 SCIENTIFIC AMERICAN, INCPatented · Patents · Inches · Machine · Elevators · Iron · Scientific American · Hydraulic · Hot springs · Holtz electrical · Trade catalogs · Naked thermometer · Steamboat springs · Wrought iron · Nitric acid · Steam engine · Fire box
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